introduction to oceanography lecture 15: primary...
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Introduction to Oceanography
Lecture 15: Primary
Productivity
Dinoflagellate Noctiluca scintillans Photo by Mona Hoppenrath, Alfred Wegener Institut, http://www.awi.de/fileadmin/user_upload/News/Press_Releases/2006/3._Quarter/Plankton1_p.jpg
Announcements: Midterms scores posted soon!
Lab 8 quiz, lab reviews this week Lab final next week…
Coccolithophore(?) bloom in the Black Sea. NASA image, Public Domain. http://earthobservatory.nasa.gov/IOTD/view.php?id=78705
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Photosynthesis Living systems require chemical energy Chlorophyll: a green pigment that captures photons and transfers their energy to
electrons, an through a series of steps creates carbohydrate molecules (chemical energy) and oxygen.
Chlorophyll looks green because it absorbs red and blue light, and reflects green light
Sargassum algae, NOAA, Public Domain, http://oceanexplorer.noaa.gov/explorations/02sab/logs/aug09/media/
lines.html
Adapted from figure
by Aushulz, Wikimedia Commons,
Creative Commons A
S-A 3.0, http://
commons.wikimedia.org/
wiki/File:Chlorophyll_ab_spe
ctra2.PNG
Photosynthesis Reaction
6CO2 + 6H2O ——> C6H12O6 + 6O2
sunlight
Carbon dioxide
water (yields) Glucose (a sugar)
Oxygen + +
Typically, ~100 grams carbon/ year / meter2 is fixed to sugar in the open ocean
This 100 grams/year/meter2 is “Primary Production”:
The rate of new organic carbon creation by autotrophs.
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Color-imetry! (yes, it means what you think) - Chorophyll enables photosynthesis by absorbing blue and red
light. Green light is reflected or scattered. - Green ocean implies lots of chlorophyll
- Lots of chlorophyll implies lots of productivity!
- Satellites like SEASTAR can measure color from space. This makes colorimetry ideal for global ocean surveys, if it works. This technique will be bad for long-lived plants (chlorophyll is present even when big plants aren’t active, I.e. spruce trees)
How can we measure productivity?
HYPOTHESIS: Green color in the ocean correlates with primary productivity.
PREDICTION: Productivity estimated from color should be the same as productivity measured by “weighing” uptake of inorganic carbon.
Colorimetry compared with “weighing”
From Measured uptake of inorganic 14C
M.J. Behrenfeld & P.G. Falkowski. 1997. Photosynthetic rates derived from satellite-based chlorophyll concentration. Limnol. Oceanogr. 42:1-20
From
Sat
ellit
e Co
lorim
etry There is good
agreement, but also a lot of scatter.�Colorimetry may be a reasonable model, but we still don’t know all the details!
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Productivity from SeaWiFS
SeaWiFS/NASA/Rutgers University, Public Domain http://marine.rutgers.edu./opp/swf/Production/gif_files/PP_9809_9908.gif
University of Michigan, http://www.globalchange.umich.edu/
globalchange1/current/lectures/kling/energyflow/typeeco2.gif
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Primary Production 1. Amount depends on:
a. Driving Energy (Solar or chemical) b. Nutrients
2. Regions of Highest Productivity a. Continental margins: Upwelling (Ekman
pumping) and vertical mixing common along margins. Also close to rivers, dust sources
b. Equatorial Divergences c. Antarctic Divergence d. Northern Pacific & Northern Atlantic
i. Deepwater upwelling in Pacific; Divergence within subpolar Arctic/Atlantic gyres
Primary Production 3. Regions of Lowest Productivity
a. Interiors of subtropical gyres i. This is where ocean water is stably
stratified i.e., surface water stays at the surface
--- Strong, stable pycnocline, little vertical mixing. Few nutrients are brought up to the surface.
--- These are the “deserts” of the ocean, most nutrients lost as dead organisms sink into the deep ocean
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Primary Production 4. Primary Producers (Autrotrophs)
a. Eukaryotic Algae (Seaweeds & Single celled photosynthesizers)
i. Benthic (coastal): minor component i. Seaweeds
ii. Pelagic phytoplankton: primary component i. Diatoms, dinoflagellates, coccolithophores, etc.
b. Cyanobacteria: blue-green algae c. Picoplankton / Archea(?) d. Chemosynthetic Bacteria: Use inorganic
compounds to get energy i. They oxidize compounds such as H2S (Hydrogen
sulfide)
Questions
Abalone, Oregon Coast Aquarium, photo by Little Mountain 5,
Wikimedia Commons, Creative Commons A S-A 3.0, http://
commons.wikimedia.org/wiki/File:Abalone_OCA.jpg
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Ocean Habitats
• Where do organisms live in the oceans? – Biozones
• Benthic vs. Pelagic – Sea floor vs. Free-floating/free-swimming
– Light Zones • Photic, Dysphotic, Aphotic
Habitat 1. Pelagic (oceanic): live in the water
column 2. Benthic: Live in or on ocean bottom
Whale shark, Georgia aquarium, Zac Wolf, Creative Commons A S-A 2.5, http://commons.wikimedia.org/wiki/File:Whale-shark-enhanced.jpg
Coral polyp, Nick Hobgood, Creative Commons A S-A 3.0, http://commons.wikimedia.org/wiki/File:Euphyllia_glabrescens_%28Hard_coral%29_with_polyps_extended.jpg
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Ocean Habitats
• Neritic vs. Oceanic– Shelf waters vs. deep waters– Neritic/Sublittoral: photic zone reaches to sea floor
Figure by Chris_huh, Wikimedia Commons, Creative Commons A S-A 3.0, http://en.wikipedia.org/wiki/File:Oceanic_divisions.svg
Light zones Photic Zone: lit by sunlight, ~ 100 - 500m deep
Euphotic Zone: autotrophs capture more energy than they use; net fixation of carbon; net production of O2
Disphotic Zone: Not enough light for profitable photosynthesis (photosynthesis < respiration)
Aphotic Zone: Permanent darkness
NOAA, Public Domain, http://oceanexplorer.noaa.gov/explorations/04deepscope/background/deeplight/media/diagram3_600.jpg
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Photic Zone Coastal waters typically have more suspended sediments,
nutrients: higher productivity Open ocean typically has clearer water, & deeper
but less productive photic zone Deserts of the ocean
NOAA, Public Domain, http://oceanexplorer.noaa.gov/explorations/04deepscope/background/deeplight/media/diagram3_600.jpg
Questions Photo Stefani Drew, Creative Commons A S-A 2.0, �
http://commons.wikimedia.org/wiki/File:Jelleyfish.jpg
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Plankton
• Definition: Drifting or weakly swimming organisms suspended in the water column
• Horizontal position depends dominantly on the currents in which they are embedded
• Planktonic = A drifting lifestyle – Jellyfish to microscopic bacteria
PLANKTON
Photo E. Schauble, UCLA
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Open ocean (and many coastal) food webs start with
plankton
Food web of Charleston Bump, NOAA/Weaver and Sedberry, 2001, Public Domain, http://oceanexplorer.noaa.gov/explorations/03bump/background/lifeonbump/media/foodweb.html
PLANKTON
Majority of Plankton are Small
photo Peter Parks, http://www.nikonsmallworld.com/detail/year/2007/5
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Sampling Plankton
• Net only samples plankton larger than mesh size
NOAA, Public Domain, http://oceanexplorer.noaa.gov/explorations/02sab/logs/aug07/media/plnet.html
Preparing for a plankton tow in the arctic, NOAA image, Public Domain, http://
www.arctic.noaa.gov/aro/russian-american/photo-gallery/Plankton-Nets-Photo-K-Iken.JPG
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Sampling Plankton Significant fraction of plankton are too small to be trapped in nets
Smallest plankters can only be captured with centrifuges, special filters.
Azam and Malfatti, Nature Reviews Microbiology 5, 782-791, doi:10.1038/nrmicro1747
Phytoplankton • ~ 4000 species of phytoplankton presently
described • New species continually being discovered • Dominant phytoplankton:
Diatoms Dinoflagellates Coccolithophores
Alessandra de Martino and Chris Bowler, PLoS, Creative Commons A 2.5, http://commons.wikimedia.org/wiki/File:Phaeodactylum_tricornutum.png
Minami Himemiya, Creative Commons A S-A 3.0, http://
en.wikipedia.org/wiki/File:Ceratium_furca.jpg
Richard Lampitt, Jeremy Young, Creative Commons A S-A 2.5, http://
commons.wikimedia.org/wiki/File:Coccolithus_pelagicus.jpg
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DIATOMS • Autotrophic planktonic algae (Bacillariophyceae) • Most abundant single plankton group • Evolved relatively recently: 200 Mya
Mary Ann Tiffany, PLoS, Creative Commons A 2.5,
http://commons.wikimedia.org/wiki/File:Diatoms.png
NOTE! White bar = 2x10–5 m
DIATOMS Pillbox morphology (2-200 x10–6 m):
Transparent, rigid shell (i.e., Frustule) Silica (glass) shell: two nested halves
Photosynthetic material inside
frustule
Mary Ann Tiffany, PLoS, Creative Commons A 2.5,
http://commons.wikimedia.org/wiki/File:Diatoms.png
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Diatoms Extremely efficient photosyntheic
conversion of sunlight to chemical energy Chloroplasts within frustule
Fixes Carbon, releases Oxygen Tiny holes in frustule allow gas/water
exchange with ocean Frustule surface may also increase
CO2 availability Skeletons used to make filters
“cold filtered, never pasteurized”
Diatoms. Chlorophyll appears green.
Alessandra de Martino and Chris Bowler, PLoS, Creative Commons A 2.5,
http://commons.wikimedia.org/wiki/File:Phaeodactylum_tricornutum.png
Diatoms • Typically found in areas of
High sunlight Temperate to Polar Waters
Cold water temperatures
Antarctic diatoms, photo Gordon T. Taylor, Stony Brook University/NOAA, Public
Domain, http://commons.wikimedia.org/wiki/
File:Diatoms_through_the_microscope.jpg
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Diatoms • Can’t swim, but have 3 ways to stay near surface
– Small size, formation of chains, colonies further increases drag
– Control density: salt regulation, produce/store low density oils
– Surface current turbulence
Antarctic diatoms, photo Gordon T. Taylor, Stony Brook University/NOAA, Public
Domain, http://commons.wikimedia.org/wiki/
File:Diatoms_through_the_microscope.jpg
Diatoms • Reproductive Cycle
– [(Asexual)n, sexual]m
– Critical minimum size requires sexual reproduction – Cycle can lead to rapid diatom blooms – Can also form
resting spores when conditions are bad
– Some species release domoic acid, a toxin for mammals (including us!).
+ + +
domoic acid
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domoic acid
Toxins can be fatal to animals near the top of the food chain (fish, sea birds, humans, cows etc.)
Figure from U. Michigan Global Change Program, http://www.globalchange.umich.edu/globalchange1/
current/lectures/kling/energyflow/energyflow.html
DINOFLAGELLATES • 2nd most abundant plankton group • Unicellular algae (Pyrrophyceae) that do
not form chains as diatoms do – exist singly, cellulose (organic) cell
walls rather than mineral skeleton.
GIRDLE
Ceratium longipies, Photo by Mitchell Sogin, UNH Marine Biological Lab,
http://www.eos.unh.edu/newsl_0708/dinoflagellate.shtml
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Dinoflagellates • Possess two flagella: motile
– 1 flagellum for translation, other for rotation
• Transverse groove: girdle, separates anterior & posterior halves
Movie by Wayne Lanier, http://www.hikingwithafieldmicroscope.com/
00%20CONTENTS/08%20Salt%20Marsh%20Mysteries/
DinoFlag188.MOV
Ceratium longipies, Photo by Mitchell Sogin, UNH Marine Biological Lab, http://www.eos.unh.edu/
newsl_0708/dinoflagellate.shtml
Dinoflagellates • Variety of feeding strategies:
Some are autotrophic (photosynthesis) Some are heterotrophs without chloroplasts Some are mixotrophs
• Can photosynthesize but also feed on other plankton
Ceratium longipies, Photo by Mitchell Sogin, UNH Marine Biological Lab, http://www.eos.unh.edu/
newsl_0708/dinoflagellate.shtml
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Dinoflagellates • Rapid reproduction in warm, nutrient rich waters
Can result in blooms: Red Tides
• Can produce a range of chemicals Bioluminescence and strong neurotoxins As with domoic acid & mercury, organisms
that feed on dinoflagellates concentrate toxins
Noctiluca scintillans, Maria Antónia Sampayo, Instituto de
Oceanografia, Faculdade Ciências da Universidade de
Lisboa, Creative Commons A S-A 3.0
Photo by catalano82, Flickr, Creative Commons A 2.0, http://commons.wikimedia.org/wiki/File:Dinoflagellate_lumincescence.jpg
Dinoflagellates
Red Tides
Red tide near La Jolla, CA, P. Alejandro Díaz and Ginny Velasquez, Public Domain, http://commons.wikimedia.org/wiki/File:La-Jolla-Red-Tide.780.jpg
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Dinoflagellates
• Post-Bloom: – After nutrients are exhausted:
• Bloom ceases • Bacterial decomposition (ie, bacterial
respiration) of deceased bloomers removes oxygen from water column
– Anoxic conditions: Post bloom fish kills
Dinoflagellates
Woods Hole Oceanographic Institute Photo, http://www.cop.noaa.gov/stressors/extremeevents/hab/
features/florida_0406.html
Fish kill during Karenia brevis bloom, Florida
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COCCOLITHOPHORES • Abundant single-celled
autotrophic plankton • Tiny (3 - 50 micron diameter)
CaCO3 (calcium carbonate) shells, about 30 shells around each individual
• Leading calcite producers in the oceans
Alaska
SeaWiFS/NASA, Public Domain, http://visibleearth.nasa.gov/view_rec.php?id=1379
Richard Lampitt, Jeremy Young, The Natural History Museum, London, Creative Commons
A 2.5
Coccolithophores • External shell of many calcareous
plates called coccoliths • Chalk is an uplifted ocean sediment
composed dominantly of coccolith shells (ie, the White Cliffs of Dover)
CoccolithsRichard Lampitt, Jeremy Young, The Natural History Museum,
London, CC A 2.5, http://commons.wikimedia.org/wiki/File:Coccolithus_pelagicus.jpg
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Coccolithophores • Thrive in warmer waters (low
nutrients) & in low light conditions, where others do not
• Maximum abundances at ~ 100m depth in clear tropical waters
Richard Lampitt, Jeremy Young, The Natural History Museum, London, CC A 2.5, http://commons.wikimedia.org/wiki/
File:Coccolithus_pelagicus.jpg
Questions
Paraeuchaeta norvegica, a copepod, photo Hege Vestheim, University of Oslo, http://oceanworld.tamu.edu/resources/oceanography-book/marinefoodwebs.htm
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Zooplankton • Definition: Animals (heterotrophs)
capable of movement but still controlled by surrounding currents
NOAA, Public Domain(?), http://oceanexplorer.noaa.gov/explorations/
02arctic/logs/mis_sum_pelagic/media/jellyfish_320.mov
Zooplankton • Types:
– Holoplankton: permanently planktonic – Meroplankton: temporarily planktonic (ie, fish larvae,
lobster larvae, etc.) • Feeding Styles
– Herbivores: eat plants – Carnivores: eat other
animals – Detritivores: eat dead
organic material – Omnivores: mixed diets
Planktonic sunfish larva (Mola mola), G. David Johnson, CC A S-A 3.0, http://commons.wikimedia.org/wiki/File:Molalavdj.jpg
Nektonic adult sunfish (Mola mola), Fred Hsu, CC A S-A 3.0, http://commons.wikimedia.org/wiki/
File:Mola_mola_ocean_sunfish_Monterey_Bay_Aquarium_2.jpg
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Zooplankton • Major Zooplankton:
– Foraminifera Radiolaria
– Ostracod Copepod
(Also dinoflagellates)
Scott Fay, UC Berkeley, CC A S-A 2.5, http://en.wikipedia.org/wiki/File:Live_Ammonia_tepida.jpg
Living Classrooms Foundation's Weinberg Education Center, http://www.livingclassrooms.org/lbo/biofilm/creature.html
Anna Syme, CC A S-A 3.0, http://en.wikipedia.org/wiki/File:Ostracod.JPG
Hege Vestheim, University of Oslo, http://oceanworld.tamu.edu/resources/oceanography-book/marinefoodwebs.htm
Foraminifera • Heterotrophic , single-celled plankton • Calcium carbonate shells (test) & spines
– Testate amoeba • Pseudopodia used to capture prey • Prey includes
bacteria, phytoplankton or small zooplankton
Movie by Heather Austin, U. St. Andrews, http://www.eforams.icsr.agh.edu.pl/index.php/
Image:ApertureB1e.gif
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Foraminifera
Photo by Howard Spero, UCSC, http://earthguide.ucsd.edu/earthguide/imagelibrary/orbulinauniversa.html
SPINES
Dinoflagellates
Radiolaria Single-celled plankton Silica tests (shells)
~ average 5x10–5 m Branched pseudopodia for food
capture Carnivorous/Omnivorous • Food: zoo- &
phytoplankton (diatoms), detritus
Sometimes possess symbiotes such as dinoflagellates
Luis Fernández García, CC A S-A 2.5, http://commons.wikimedia.org/wiki/
File:Radiolaria_varios.jpg
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Radiolaria Sedimentary Fossils
Eocence radiolarians (34-56 million years old), Ocean Drilling Program/NSF image, http://www-odp.tamu.edu/public/life/199/week2.html
Ostracods • Two clam-like shells • Crustaceans:
0.5mm - 25 mm – 2mm is typical
• Originated around 550 Mya!
• Some are bioluminescent
• Consume plankton, many are also bottom-dwelling scavengers.
Danielopolina mexicana – actually a cave-dweller http://www.tamug.edu/cavebiology/fauna/PhotoGallery/
Yucatan/Yucatan-sm-crustaceans-1.html
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Copepod • Crustacean: average sizes 0.5 - 15 mm
– Max size ~ 25 mm – ~ 9000 known species
• Voracious feeder/filterer • Forms key food for many
other larger plankton and nekton
Image from Museum Victoria, Australia, http://museumvictoria.com.au/crust/
copbiol.html
Photo Alfred Wegener Institute, http://www.awi.de/fileadmin/user_upload/News/Press_Releases/2006/3._Quarter/Plankton3_p.jpg
Copepod
http://www.seaprofiles.com/copepod.html
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Copepod motion
http://jeb.biologists.org/cgi/content/full/206/20/3657/DC1
Reconstructed feeding currents
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Copepod motion
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